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Simplifying 7a + -18 = -3(-3 + 3) + 7a Reorder the terms: -18 + 7a = -3(-3 + 3) + 7a Combine like terms: -3 + 3 = 0 -18 + 7a = -3(0) + 7a Multiply -3 * 0 -18 + 7a = 0 + 7a Anything times zero is zero. -18 + 7a = 0 + 7a Remove the zero: -18 + 7a = 7a Add '-7a' to each side of the equation. -18 + 7a + -7a = 7a + -7a Combine like terms: 7a + -7a = 0 -18 + 0 = 7a + -7a -18 = 7a + -7a Combine like terms: 7a + -7a = 0 -18 = 0 Solving -18 = 0 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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